<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>border制作形状</title>
    <style>
        div{
            display: inline-block;
        }
        .box1{
            width: 0;
            height: 0;
            margin: 50px;
            /*transparent表示透明的  */
            border: 50px solid transparent;
            /* 不同颜色 */
            border-top-color: blue;
            border-right-color: blue;
            /* border-bottom-color: yellow;
            border-left-color: aquamarine; */

        }
        .box2{
            width: 0;
            height: 0;
            margin: 50px;
            /*transparent表示透明的  */
            border: 50px solid green;
            /* 不同颜色 */
            border-top-color: pink;
            border-right-color: skyblue;
            border-bottom-color: yellow;
            border-left-color: aquamarine;
        }

        .box3{
            width: 0;
            height: 0;
            margin: 50px;
            /*transparent表示透明的  */
            border: 50px solid transparent;
            /* 不同颜色 */
            border-top-color: #40e0d0;
            /* border-right-color: skyblue;
            border-bottom-color: yellow;
            border-left-color: aquamarine; */
        }
        .box4{
            width: 50px;
            height: 50px;
            margin: 50px;
            /*transparent表示透明的  */
            border: 50px solid transparent;
            /* 不同颜色 */
            border-top-color: pink;
            /* border-right-color: skyblue;
            border-bottom-color: yellow;
            border-left-color: aquamarine; */
        }
    </style>
</head>
<body>
    <div class="box1"></div>
    <div class="box2"></div>
    <div class="box3"></div>
    <div class="box4"></div>
    <div class="box5"></div>
    <div class="box6"></div>
    <div class="box7"></div>

</body>
</html>